Liquid coating composition



3 v i 7 ca E (in Patented Oct. 29

wA'rsoN'E. woonronn, or nnrncnron'r,

counnc'rrcur, AssIeNo'R TO REMINGTON ARMS GOMPAN Y; ING., A CORPORATION OF DELAWARE LIQUID COATING COMPOSITION No Drawing.

This invention relates to lacquers'or varnishes and especially to a composition which may be applied over a surface which is coated or contaminated witlbw'ax or grease, and adheres' to and completely covers such a surface, and-quickly dries thereon. it is well known that ordinary varnishes and lacquers cannot be applied to surfaces upon which waxes, greases, or oils are pres- 10 ent. The varnish or lacquer does not adhere to a greasy surface and special'diificulties are encountered if a wax such as paraffin wax is present.

While a paraliin surface does not repel lacquer or Varnish, the drying ofthe la'cquer or varnish on'such a surface is retarded indefinitely. If the surface dries at all, a soft paraliin finish and not a hard varnish finish is secured. It is thought that the reaction which occurs when 'a volatile solvent lacquer paint or varnish to be removed.

Quickgdrying varnishes and lacquers use as solvents acetone, benzine, alcohol, and similar substances, It is thought that when such a varnish or lacquer is applied over para'flin, paratfin is dissolved in the solvent and quickly reaches ghe .free surface Where a film 8.Il2l.l--

ogous to the paint remover'film is formed and the drying of the varnish is thereby greatly retarded.

' In certain industrial processes, for example, the manufacture of paper tubes for shot shell b d thesisentparati n inpregnatedpaper 'ishjghly desirable on accountpf the capacity particularly to shot shells, when a shot shel "is fired, a very large quantity of heat is generated within the shell by the combustion of the powder and momentarily a high temperature is reached. Theicmperaturewdrops is thus enabled .to penetrate and soften the- Qt."perat nciarnabrsnrbi gaheat- Referrine App1ication filed September 10, 1927. Serial is. 215,855.

rapidlnaadsntebahly awitliiaamtsrassseeds has been reduced below the charringpoint of the. cartridgempaper...iizmusirhinhmthewshc shells are made. However, it is manifestly very important that the paper be protected,

during the brief period of its exposure to in- 5 tense heat, and parafiindiessbneenqeitayniersallynnsedliianthewmanufacturewnfnshot hellsaiaiiggt gy bgggbent and for other desirable properties If the paper shot shell is well impregnated with parailin, it does not reach a temperature at which an undesirable or dangerous amount of charring takes place. However, it is also very desirable that shot shells be made impervious to moisture. While paraflin, itself, is somewhat moisture resistant, it is incapable of preventing the absorption by the paper of a sufiicient amount of moisture to cause such swelling of shot shells as will render them'useless. For this'reason, methods for producing shot shells which are heat resistant and at the same time capable of receiving a coat ofvarhish have long been sought. The applicatlon of varnish to a paraifin impregnated paper has hitherto been considered impossible' for the reasons above discussed. The present invention comprises the discovery of a varnishiwhich may be applied to a paraffin surface and will dry upon such a surface. with extreme rapidity, completely covering 0 the surface with a film which is, itself, quite impervious to moisture and upon which oth er varnishes or lacquers may be applied to secure special finishes if desired.

. The usual varnishes and lacquers comprise not only ia gum or pyroxylin'base which furnish the body of the film and a volatile solvent foithe base, but also a plasticizing ingredient for toughening the film and rendaring 'itmore flexible. It has been found that a varnish consisting merely of a glyceride ester of rosin, colophony, the copals and similar substances dissolved in acetone shows most extraordinary characteristics. When' applied to a paraffin surface it dries with extreme rapidity. Inded, its drying time is so brief as to lead to the belief that somereaction other than the ordinary evaporation of the solvent must take place. 10

When an ordinary shot shell tube is dipped in this varnish, the surface dries completely in about ten seconds time, leaving a film which appears to consist substantially entirely of ester resin, no parafiin having been dissolved and none being present on the sur face.

While varying amounts of the ester gum may be used, the best results have been se- 10 cured by a composition which includes about I 35%, by weight, of the gum. This quantity of the solid does not appear to be complete- 1y dissolved. Upon standing, the composition separates into two quite distinct layers, but both layers appear cloudy. This appearance may be due to the presence of undissolved solid in suspension; One possible explanation of the extraordinarily rapid dryin g is thatthe composition is really a supersaturated solution and, therefore, unstable,

. and that when the super-saturated solution is spread upon a surface, the evaporatmn of a very small amount of solvent disturbs an unstable equilibrium and extremely rapthe solid 6. The method of covering a paraffin surface which comprises the application thereto of a varnish consisting of ester gum in acetone.

7. The method of waterproofing parafiined prises t e application thereto of a varnish consisting of ester gum in acetone.

8. A paper tube having applied thereto a. varnish consisting of ester gum in acetone.

aper tubes and the like which com- 9. A shot shell having applied thereto a varnish consisting of ester gum and acetone.

10. A-parafiinedpaper tube for shot shells having applied thereto a varnish consisting of ester gum and acetone.

WATSON H. WooDroRD'.

such estergum acetone varnish is tough and flexlble, though somewhat soft for some purposes. However, the paraffin is effectively and completely covered, and ordinary varnishes or lacquers may be applied over the .ester gum varnish if greater hardness or other special properties are desired.

In the appended claimsthe terms ester gum will be understood to include any glyceride ester of rosin, colophony, the copals and similar substances.

Varnish whichwill cover and dry upon a waxed surface being new with this applicant, the appended claims are to be broadly.

construed. What is claimed is: f r

1. A varnish consisting ofester gum and acetone.

2. A varnish comp rising acetone and an of ester gum dissolved and suspended excess therein,

3. A varnish consisting of substantially 75% of acetone and 25% ester gum. r

4. A varnishconsisting of ester.gum and acetone having the propert of drying when spread in about ten second s time. 5. A varnish comprising acetone as a solvent having the propertyof rapidly and completely drying upon a paraflin surface. 

